This LFCS practice question tests your understanding of storage management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are managing a Linux server that hosts a critical application using a 500GB ext4 filesystem on an LVM logical volume. The application writes large log files that are rotated weekly. Recently, the system has been experiencing intermittent performance degradation and occasional 'Input/output error' messages when writing to the log directory. The disk (SSD) is relatively new, and SMART tests report no errors. The filesystem is not full, with 60% usage. You notice that the errors occur more frequently during peak write times. Which of the following is the most appropriate first step to diagnose and resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Unmount the filesystem and run 'e2fsck -f' to check and repair filesystem corruption.
Option C is correct: Running 'e2fsck -f /dev/vg/lv' will force a filesystem check and repair any inconsistencies that could cause I/O errors. Option A is wrong because SMART is already clean. Option B is wrong because mounting with noatime might help performance but won't fix errors. Option D is wrong because increasing LVM cache requires additional hardware and may not address filesystem corruption.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Add an LVM cache layer to improve write performance.
Why it's wrong here
This adds complexity and does not address potential corruption.
✓
Unmount the filesystem and run 'e2fsck -f' to check and repair filesystem corruption.
Why this is correct
Filesystem corruption can cause I/O errors even if disk is healthy.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Replace the SSD immediately as it is likely failing despite SMART tests.
Why it's wrong here
SMART shows no errors, so replacement is premature.
✗
Mount the filesystem with the 'noatime' option to reduce write overhead.
Why it's wrong here
This may reduce writes but won't fix existing I/O errors.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
SMART shows no errors, so replacement is premature.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the LFCS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which LFCS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Storage Management — This question tests Storage Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Unmount the filesystem and run 'e2fsck -f' to check and repair filesystem corruption. — Option C is correct: Running 'e2fsck -f /dev/vg/lv' will force a filesystem check and repair any inconsistencies that could cause I/O errors. Option A is wrong because SMART is already clean. Option B is wrong because mounting with noatime might help performance but won't fix errors. Option D is wrong because increasing LVM cache requires additional hardware and may not address filesystem corruption.
What should I do if I get this LFCS question wrong?
Identify which LFCS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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